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Question

When the vascular cambium is present between the xylem and phloem, the vascular bundle is called

A
Closed
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B
Open
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C
Endarch
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D
Exarch
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Solution

The correct option is A Open
Xylem and phloem together form vascular bundle. It is of 2 types, simple and compound. The compound vascular bundles are further divided into concentric and collateral. In collateral vascular bundles, xylem and phloem are arranged side by side on the same radius. When the vascular cambium is present between the xylem and phloem, the vascular bundle is called open collateral vascular bundle. Example includes dicot stem. When the vascular cambium is not present between the xylem and phloem, the vascular bundle is called closed collateral vascular bundle. Example includes monocot stem.
Thus, the correct answer is 'Open.'

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